Unless otherwise specifically exempted by the commission, it shall be unlawful for any motor carrier operating under a Certificate of PC&N or FWA to make, give, or cause any undue or unreasonable preference or advantage to any particular person, port, gateway, locality, or description of traffic in any respect whatsoever, or to subject any particular person, port, gateway, locality, or description of traffic to any unjust discrimination or any undue or unreasonable prejudice or disadvantage in any respect whatsoever.
S.C. Code Regs. § 103-197